Button-blank-cutting machine



Nov. Z`6, 1929.

A. L. CURRIER BUTTON BLANK CUTTING MACHINE Filed 4Oct. 8, 1926 164 3*-11oz Nov. 26, 1929.

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A. L. CURRIER BUTTON BLANK CUTTING MACHINE Filed oct. 8. 192e 3.Sheets-Sheet 5 Patented Nov. 26, i929 UNl'l'ff 'STATES rA'rv-ENT.oF-rice BU'r'roN-nLanK-ccrrrne naci-nun Appiieationvled Getober 8,1326.

My present invention is a novel and iniproved cutting machine intendedprimarily for use in cutting' out button blanks from shells orequivalent material.

In the manufacture of button blanks from either fresh water or saltwater shells, usually known as pearl button blanks, it is necessary toposition and hold the shell or material, and cut or saw the blanktherefrom. The shell is then shifted, if large enough to form one ormore blanks therefrom, and a second blank cut, and so on. These shellsare very fragile, being' frequently of uneven contour, while thecutting' saws utilized must be continually removed and renewed forsharpening.

Important objects of my present invention Aare to improve and perfect abutton blank cutting' machine, for this work, and to provide apparatuswhich will insure firm, quick and easy holding and cutting; `which willenable the operatorto manipulate the machine with much greater ease andefficiency than has heretofore been possible, and which will insure thesteady and uniform production of the machine lessskilled labor than wasformerly necessary.

A further and very important feature of my present invention is theprovision of means for more readily and easily `removing, replacing, andrenewing the cutting saw. As above briefly outlined, the cutting,` sawsin this type of machine must be constantly renewed, as a dull saw willbreak and mar the shell by chippingthe edges or the'like, and thereforea considerable amount of time has heretofore been consumedV by theoperators in replacingv worn saws. My present machine is directed tofacilitate this renewal of saws with a minimum of time andV effort.

A further most important feature of the present invention is theprovision of novel and efficient shell holding means, which arepreferably automatic in operation and which will enable the materialfrom which the blanks are cut to be firmly and quickly held under auniform tension, even when the blank is of varying' surface contour.

It will be `appreciated that the shell surface, from which button blanksare cutpar- Serial No. 140,371.

ticularly a large surface, is of extremely uneven contour, and hence theold instrumentalities as heretofore employed often contacted only at asingle point of the blank to be cut. Hence the blank might be distortedin cutting, might be cut unevenly,vand might slip or be disalined duringthe cutting. My present invention obviates the difficulties abovebriefly noted, and insures a plurality of blank engaging devices capableof automatically fitting the uneven contour of the surface of blankwhile still holding the blank at the plurality of points under asubstantially uniform tension, whichholding and .tension devices areautomatically controlled.

In carrying out my invention I have devised a machine of extremelysimple and efficient construction, of most compact and convenient form,with provision for readily swinging or moving the lower blank holdingvdevices at one side to facilitateremoving ano renewing thecutting saw,together with an improved cutting saw holding chuck. The saw holdingchuck feature of my invention is of very great importance, and two formsof the chuck are shown and described herein, but modifications of thesame are more fully illustrated and described in mycopendingrapplication, Ser. No. 140,770, `filed, October 11, 1926. Iconsider the. provision of van improved saw holding chuck, which willbesubstantially automatic in its release as well as in its holding andengaging action, greatly facilitating` the ease and speed of renewingthe cutting saws, to be of very 2great im-r portance in the operation ofthis machine. I preferably form the removable chuck spool or spun, andthe recess in the spindle to which said spool is applied of anon-wedgingtaper construction. yIVith this construction I achieve novel results, inthat regardless of .the locking instrumentalities, the spool willautomatically disengage from the socketpor recess in the spindle,droppinginto the op- .erators hand. I .believethat this is an importantfeature, and I have therefore claimed the same herein broadly.

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Further important features, novel combinations, details, and advantageswill be hereinafter more fully pointed out and described. Referring tothe drawings illustrating a preferrcd embodiment of my invention,

Fig. 1 is a front elevational View of my improved button blank cuttingmachine;

Fig. 2 is a side view of the machine;

Fig. 3 is a cross sectional view on the line 3-3 of Fig. 1;

Fig. 4 is an enlarged fragmentary cross sectional view illustrating theoperation of the plurality of holding devices on a blank of unevencontour;

Fie'. is a fragmentary view of the engaging faces of the holdingdevices;

Fig. 6 is a plan view of the machine;

Fig. 7 is fragmentary rear view of the machine;

Fig. 8 is a view, partly in cross section, of the chuck holding,driving, and releasing devices showing a modilication;

Fig. 9 being a cross sectional View on a reduced scale on the line 9--9of Fig. 8;

Fig. 19 is a cross sectional view on the linevlO-lOof Fig. 2, and n Eig.11 1s a view in perspective or the washer tightening member.

It will be appreciated that my machine may be modiiied in various waysand forms and may be embodied as a small bench machine before which theoperator may stand or sit, or as an entire machine unit, bolted orsecured to the floor, the latter form being herein employed forillustrative purposes,

and arranged for an opera-tor to be seated in front of same.

As shown in the drawings, my machine comprises a standard 1 secured to aplate 2 which rests on the floor and to which the saine may be bolted,if desired. The standard 1 carries a pair of projecting brackets 3 and 4and arm 5 at the front of the machine to carry the operating devices,and a forked pair of arms at the top of the frame to provide bearingsfor the shaft 7 carrying therebetween a cam 8, the sha-ft 7 and cam 8being Uusted by a lever 9 and a handle 10, the latter arranged inconvenient position for the operator.

rihe arm 5 is pivotally secured to a pin 12 fitted through bearings inthe boss 13 at the rear of 'the machine, as clearly shown in Figs. 2 and3, the projecting end of said arm being secured by a pivot pin 14 to asocketed member 15 carrying a rod 1T fitted in the socket and heldtherea by a pin 18. rEhe bracket 3 is recessed, as shown at 19, throughwhich the rod 17 may pass, such recess being preferably counterbored, asillustrated in Fig. 3, to receive the lower portion of a coil spring 2Oencircling the rod 1T and bearing between the counterbored lower portionof the recess- 19 and the member 15, normally exerting an upward tensionagainst said member 15, and adapted to hold the same in constant Contactwith the lower surface of the cam 8. lf desired, l may provide a roll21, also pivoted on the pin 14, to give an anti-friction bearing 21between the same and the cam 8.

The rod 17 extends downwardly through an enlarged recess in the bracket4, and carries at its lowermost end, adjustably secured thereto by a pin22, a block 24 which, in turn, carries one or more water nozzles orpipes 25-25 in posit-ion to drive a constant stream of water on theshell and work during the button sawing operation. The water may besupplied from any suitable source Vand thro-ugh a pipe 26, and with anelbow or, if desired, a flexible connection 28 from said pipe to theblock 24 and thence to the nozzles 25-25, which will rise and lowerslightly during the operation of the machine, and yet at all timesdirect the water supply onto the work.

I prefer to utilize the rod 1T as a means to actuate the spindle andchuck` and the holding devices for the saw and blank. Thus, a slightaction of the cam 8, when moved by the handle 10, and lever 9, willreciprocate the rod 17, either downwardly or permit its upward movementthrough the action of the sprng 20, and this movement is communicated tothe spindle,4 as will be now described.

The spindle carrying the saw holding chuck andk workholding devicescomprises a tubular shaft 30 slidingly mounted through appropriaterecesses 31 in the bracket 3.v and 41 in the bracket 4, as clearly shownin Fig.v 3. The spindle 30 has keyed thereto in an appropriate posit-iona pulley 33 rotated by a belt 34 led around idler pulleys 35. Thepulleys 35 are mounted on a pin 44 in the ears 44a of the bracket- 45,which bracket is fulcrumed at the rear of the frame 1 on the bearing pin39. The lever 38 is also mounted on the pin 39 adjacent to the rear ofthe frame 1. The bracket 45 pivots on pin 39, spanning the lever 38 andis held in adjustment by nuts 47 and 48 on a threaded shaft 50 whichshaft, in turn, is secured in any suitable way to the frame 1, and asherein shown being threaded into a tapped recess 52 in a portion of thelower bracket 4. This arrangement permits a belt tightening effect bymanipulation of the locking nuts 47 and 48, thus rocking the bracket 45on the pin 44. The shaft- 50 with the locking nuts thereon extendsthrough a slotted recess 53 in the bracket 45, thus permitting thebracket 45 to still rock upon its fulcrum 39. Preferably these lockingnuts are slightly rounded, as clearly shown in Figs. 2 and 3, thereforepermitting a rocking action, while the slot 53 facilitates the sainewhile still permitting the locking nuts to effect the belt tightening.

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The spindle carries a vflanged hub or bearing spaced from the pulleywheel 33 to receive a loosely fitting collar 61, said collar having apair of ktrunnions (i2- 62 diametrically positioned over which the:torked arms 63-63 are tted, said arms being the forward extensions ofthe lever 38 Consequently vertical movement or oscillation ot the lever38 on its fulcruin 39 thus etiects a raisino or lowering of thespindle30 during its continuous rotation through the actuation of the pulley 33rigidly secured on said spindle. The collar 61 is firmly and rigidlyheld in position while permitting a tree rotation of the spindle duringthe operation of the machine.

'To eil-ect the raising and lowering of the spindle, I prefer to utilizethe aiin 38 and the rod 17. As above explained, the rod 17 passesloosely through an enlarged opening in the arm 38, which aiin ispreferably provided with a concaved boss 66 at the upper part, andconvexboss 67 at the lower part. The rod 17 is also threaded, and is Vprovidedwith a plurality ot locking nuts 68 bearing against the upper boss 66 totake up the thrust et the cam 8, the latter causing depression of boththe lever 38 and hence movement of the spindle 30 down onto the work. Inorder te provide a yielding adjustment of this connection between therod 17 and the lever 38, I supply a washer 70, coil spring 71, and athreaded nut 72, as illustrated in Fig. 3, land adjustment of thelocking nuts 68 and 7 2 serves to adjust the relative position of thelever 38 on the rod 17.

lNhile my machine as thus tar described is operated to rotate thespindle 3() to which any suitable saw or cutting device may be secured,l prefer to utilize a novel type of chuck and saw holding apparatus forholding the work. The feature of my invention permitting the workholding devices to engage the shell at a plurality ot separatelyadjustable and independently actuable points while still held under auniform tension and also permitting an instantaneous removal andreplacement of the cutting saw, is or great importance and will now beeX- plained.

The spindle 30 is formed hollow to re ceive the internally arranged workholding devices, said spindle furthermore being formed at its lower endwith an internally bevelled tace -see Fig. 1. At opposite point-s areprovided openings or recesses 76 arranged to receive holding, drivingand locking balls 77. Fitted around the spindle 30 is a recessed ring 80having an internal annular grooved or recessed portion 81 and an outergroove 82, said outer groove being adapted to receive the top portion ofa coil spring 83. The recess 81.is of suilicientiiextent so that, `whenrelative movement is effected betweenthe ring 8O and the spindle 30,each ball 77 may be forced within the recess 81 and permit the bevelledsocket part 86 otthechuck 88 to be released ytrom locking engagementwith tlieball 77. rlhe chuck/88 is also formed with a cooperatingbevellejd face to t the bevel 7 5, and with ari-annular groove or recess90 in lwhich a Aportion oit the locking balls '77 lit or slide 4when thering 80 and spindle 30 are in the relative position shown in Fig. 1;viz: when the chuck-88 is locked to the spindle 30.

'Upon release of the balls 77 from engagein the lower portion of the rimof the spindle 30.

Fitted adjustably through the bracket a and in alineiiient with thering'80, are a plurality of adjustable rods 96 which may be held inadjusted position by appropriate set screws 97. Consequently, on thevertical movement ot the spindle 30, the saine may be moved until saidring 8O is brought into engagement with the ends oi' the rods 96, whichwill thereupon depress said rin-g l80 againstA the tension of thelspring 83, bringing the recess'l 81 into alinenient with theflockingballs '77, into which recessesy the balls 77 will nor-- mally move, thusmoving out oi` the groove 90 in the chuck 88 and releasing said chuckand permitting the chuck to be instantly removed.

`lVhen replacing the chuck spool or spun 88, the operator simplygri-isps said chuck by the depending stem 98, holds it upwardly into thebevelled recess inthe spindle 30, the pin or stud 94 engaging the groove95 and thus guiding the spun or spool, and snaps 'the chuck past or bythe balls 77, which will be engaged in the recess or groove 90, and willthereupon hold, lock, and drive the chuck with the spindle 30.

The chuck 88 ishollow and has a depend- `ing shank 98 which receives thetubular saw ,100. Preferably these saws are split spring metal which aredriven into the slightly bevelled inner walls of the chuck 88 and theshank 98 so that at the saw cutting edge, the

same will be a substantially continuous line,

rlhis hollow arrangement also permits ot my novel workholding devices101 and 102 which are arranged to project in advance ot the cutting edgeot the saw 100, and may be of any suitable material such as sott brass,and may also have hardened serrated work engaging faces, asshowninrFigs. land 5,

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back of the machine. 123 will filter through the screens 125 into awhich work, shell or material is usually resting on a wood, rubber, orfibre block 106.

In order to support the work rest, or block 106 I provide a swingingbracket 110 having a threaded interior in which the adjusting screw 111is fitted and manipulated by a wheel or handle 112. Preferably acushioning member 113 of wood is fit-ted between the adjusting member111 and the work block 106, which latter may have an interlockingengagement, as shown in Fig. 3, in order to lower or draw down the block106, as well as force the same upwardly by appropriate rotation of thehandle 112, as desired. This work block 106 is substantially surroundedby a splash plate 120, said splash plate forming a portion of the chute123. Surrounding the splash plate 120 and upper part of the chute 123,are the walls 120a of the tray 121, which tray is adapted to hold shellsor other material to be operated upon, in ready reach of the operator.The tray 121 and walls 120a thereof are secured to the frame 1 by screwsor the like 1201. The chute 123 extends downwardly and rearwardly as aspout-like portion through the opening 124 of the main frame 1, tocollect blanks, and waste shell scraps, and the like, and also preventsthe water flowing from the nozzles 25 from unduly splattering theoperator. A drain 120c is provided into the splash pan or chute 120 fromthe tray 121, so that any water in said tray will flow into the chuteand out at the l'later from the chute catch groove 126 and thencethrough a pipe 127 to a suitable place of discharge, while the buttonblanks will travel down the screen 125 into the receptacle 130 to beremoved as desired.

As thus described, the operation of the machine will be readilyunderstood. Upon manipulation of the handle 10, swinging the cam 8 inposition to depress the rod 17, said movement also swings the rockinglever 38 on its fulcrum and depresses the rotating spindle 30 until thework engaging portions of the devices 101 and 102 contact with and holdthe shell 105 to be cut. Thereupon the continued downward movement ofthe rotating spindle 30 brings the serrated edge of the saw 100 intocutting engagement with the shell 105, cutting a blank therefrom as thesaw travels on downwardly around the holding devices 101 and 102, andthrough the shell and, if necessary, slightly into the block 106. Theoperator thereupon releases the handle 10, or brings it backwardly,assisted by the spring 20, and the shell 105 is re-positioned forcutting another blank. This operation is continued until it is desiredto renew the saw, whereupon the operator continues the upward movementof the lever 9 until the ring 80 will contact with the pins 96,whereupon the chuck is automatically released, permitting ready removalof the saw 100, and replacement of a new saw, whereupon the 0peration ofthe machine is continued as before.

To facilitate the removal and replacement of the chuck 88, I provide anysimple means desired to swing the work block 106 out of immediatealignment or position with the chuck 88 and thus permit the more readyremoval and replacement of the chuck spun. To this end the entirebracket 110 is mounted to swing in the ears 122 provided on the tray ortable 121, being released from vertical position by the cam 132 operatedby a lever 131 bearing against a bridged washer 129 and mounted on ashouldered pin 130, as illustrated in Figs. 2, 10 and 11. This permitsquick and instant release of the bracket 110 and swinging of the sameout of position and its replacement.

ln order to provide an independent and yet uniform action on the workengaging members 101 and 102, I extend the same through the hollow chuckand spindle, as above eX- plained, and thence upwardly, aswill be nowexplained.

Fitted loosely in the upper part of the spindle 80 is an externallythreaded sleeve 140 carrying with a frictional engagement the workengaging members 101 and 102. The lfearing nut 141 isiitted around suchsleeve in position to compress a spring 142 between the nut 141 and thecrosshead 145. This crosshead 4has a pair of opposite extensions 146 and147 to which are pivotally secured a pair of depending links 148 and 149eX- tending from the crosshead downwardly to pivotal engagement with thetrunnions 62 on the collar 61. Hence the depression of the lever 38through the actuation of the cam 8 on the rod 17 serves to movedownwardly the spindle 30 and will also serve to move downwardly acorresponding distance the sleeve 140 carrying the work engaging members 101 and 102 by reason of their frictional engagement therein. Tnorder to prevent the sleeve 140 from rotating, the crosshead 145 has arearwardly extending arm 150, which arm has a forked extension 151bearing loosely on the member 15, as clearly shown in Figs. 2 and 3.Mounted also on the sleeve 140 is an adjusting hand wheel 155 threadedthereon and bearing against the top of the crosshead 145 t thus permit araising or lowering of the sleeve 140 as desired. A coil spring 156serves to hold the wheel 155 locked in position while permitting ayielding action between the same and the V-shaped member 160. Thislatter member has its two arms or legs recessed, each carrying aninternal plunger 161 adapted to engage one of a series of notches 162cut respectively in the adjacent side port-ions of the tops of themembers 101 and 102. Each plunger is under yielding tension between acoil spring 163 bearing on top of the plunger 161 and an adjusting screwltthrea ded into the top portion of the open end ot each leg of the V.Thus the plungers willnormally hold their respective portions 101and'102 downwardlyunder a yielding tension andyet will permit theindependent verticalmovement of each mem-v ber 101 and 102 as the samecontacts with and seats itsel'lf on either an even or uneven surface inthe shell or work 105. Furthermore, cach spring being substantiallyunder similar compression, will'lioldthe work engaging portions with auniform tension and at a plurality otI points.

My improved machine, providing as it does, conveniently arranged,compactlypositioned, and economically7 formed andl constructedapparatus, permitting a quick and rapid manipulation, instantaneousrenewal and replacement,ol the saws and chucks, and firmly holding'means to engage the work at a plurality o't',points, automaticallytaking care of differences in contour ot the shells, presents a newmachine which is a distinctV improvement in this art and which l wish toclaim herein broadly.

is above noted, l have several modilications of construction inlconnection with the chuck holding devices.v ln Fig. 8 I have illustrateda simple modification of the chuck holding means permitting quick andready manual manipulation for the locking or releasing instead of thesemi-automate arrangement, as shown in Fig. l, and heretofore described.As illustrated in Fig. 8, the spindle has the recesses 76 therein toreceive the locking ball 77 and the bevelled surface 75 to receive thecorrespondingly bevelled head o'i the spool or chuck spun 88 carryingthe saw 100 in its shank 98. In this form, however, l provide a simpleenclosing and lifting ring 170.

This ring is preferably counterbored at 176 and again at 177 to thusatl'ord a large annular recess 180 sutliciently spaced 'from the outersurface ot' the spindle 80 to permit the locking ball 77 to roll thereinand be released from the grooves 181 in the head of the chuck 88 whenthe ring 170 is lifted. rllhus the operator, when desiring to remove thechuck 88, raises or lifts the ring 170,

fithout stopping rotation of the spindle, if desired, until the lockingball 77 will roll outwardly into the space provided. Thereupon the chuck88 can be removed or, indeed, will drop into the operators hand. Thehead of the chuck 88 has iormed therein a pair of spiral grooves, asclearly shown in Fig. 8, adapted to cooperate with and receive theprojecting portion of the locking balls 77 when the chuck is replaced inposition and the ring 170 dropped downwardly or can be put into positionafter the ring has dropped down, the portion 170 forcing the balls 77into holding', locking, and driving engage ment with the chucks 88.These grooves 181 may be, and preferably are, formed on the inoline fromthe outer surface of the chuck 88 into a ysutlicient depth to receivethe balls 77, as clearly shown in Fig. 8, whereuponthe balls will jump,either between the bottoms ot the grooves and the ring' 170, or betweenthe edges ofthe grooves in the chuck and the ring' 170,thereuponimpartingto the chuck and' saw the rotating' action of thespindle 30. l'believe that my'invention of a quickly removable andrenewable chuck, particularly for machines oi' this type, is'distinctlynew and I claim the same broadly in my said copending` application, Ser.No. 140,770, tiled October 11, .1926, claiming, in this application theadvantages, features, and combination of such a chuck with my improvedbutton blank cutting machine.

is illustrated shown inllig. 1l, the inner bevelled tace or taper 7 5 otthe spindle,and the correspondingly tapered tace ot the spoolf86 areformed oli` a non-wedging taper.construction. krlhis results in a chuckstructure of great advantages. in that the spool cannotl jam in thespindle, the non-wedging taper construction providing for instantdisengagementof'the spool from the spindle recess upon release of thelocking balls 77. Similar non-wedging taper. constructionis illustratedin Fig. 8, wherein the oevelled face of the chuck spool is formed tcco-act with the taper tace or bevel 7 5 ofthe spindle 30, in such amanner that a non-wedglng' taper construction is obtained, with theadvantages ofthe formallust-rated inlllig. 1l'.

lt willalso be appreciated that cachot the formsy of' chuck illustratedand described herein. maybe utilised in a liorizontal'operatingposition. with equal 'facility andv efficiency as in the verticalposition herein illustrated. knis greatly broadens the field of utilityof my novel-chucks, enablingthem to be embodied in many kinds olmachines.

Havinfrv thus describedmy invention, what l claimfas new is:

,1. In a machine 'for cutting out button blanks, a worksupport on whichthe materialto be cut is positioned, afrotating spindle' adaptedformovement toward and from the work to cut a butt-on blank therefrom, andplurality of independently movable work holding members movable withandthrough said spindle, yeach member beingA independmanually operatedmeans for moving the* member downwardly, automaticv means 'for movingsaid memberV vertically, an oscillating arm pivoted on said frame, meansconnecting'the arm to said member, means conin the form of chuck neetingsaid arm to said spindle,a pulley keyed to said spindle, a belt fordriving said pulley, a bracket spanning said arm and secured to the rearof said trame, guide pulleys mounted on said bracket, said brackethaving a depending portion adjustably secured to a portion of said frameand constituting a belt tightening means for said guide pulleys.

3. In a machine for cutting out button blanks, a work support on whichtliematerial to be cut is positioned, a hollow rotating spindle movabletoward and from the work, a cutting tool in said spindle, a plurality ofindependently automatically movable work holding members arranged withinand en tending above said spindle and contacting with the work inadvance of the cutting tool during the movement of the cutting tooltoward the work, a V-shaped member located above said spindle andthrough which sai-d work holding members pass, spring con trolledplungers in said V member engaging notches in said Work holding membersto normally hold said members in position and torce the work holdingmembers toward said work support.

4. In a machine for cutting out button blanks, a work support on whichthe material to be cut is positioned, a hollow rotating spindle movabletoward and from the work, a cutting tool in said spindle, a plurality ofindependently automatically movable work holding members arranged withinand eX- ten-ding above said spindle and contacting with the work inadvance of the cutting tool to force the work against its support duringthe movement of the cutting tool toward the work, frictional supportingmeans for said work holding members, a V-shaped member located abovesaid spindle and through which said work holding memb rs pass, springControlled plungers in said V member engaging notches in said workholding members to normally hold said members in position, and yetpermit independent vertical adjustment of said work holding members.

5. In a machine for cutting out button blanks, a work support on whichthe material to be cut is positioned, a hollow rotating spindle movabletoward and from the work, a cutting tool in said spindle, a plurality ofindependently automatically movable work holding members arranged withinand eX- tending above said spindle and contacting with the work inadvance of the cutting tool to force the work against its support duringthe movement of the cutting tool toward the work, a V-shaped memberlocated above said spindle and through which said work holding memberspass, spring controlled plungers in said V member engaging notches insaid work holding members to normally hold said members in position andyet permit independent vertical adjustment of said work holding members,and a sleeve depending from said V member and loosely iitted in theupper portion of said spindle and surrounding said work holding members.

6. In a machine for cutting out button blanks, a work support on whichthe material to be cut is positioned, a hollow rotating spindle movabletoward and from the work, a cutting tool in said spindle, a plurality otindependently automatically movable work holding members arranged withinand extending above said spindle and contacting with the work in advanceof the cutting tool to force the work against its support during themovement of the cutting tool toward the work, a V-shaped member locatedabove said spindle and through which said work holding members pass,spring controlled plungers in said V member engaging notches in saidwork holding members to normally hold said members in position and yetpermit independent vertical adjustment of said work holding members, asleeve depending from said V member and loosely i'itted in the upperportion of said spindle and surrounding and holding said work holdingmembers and being vertically movable with said spindle.

In testimony whereof, I have signed my name to this specification.

ARTHUR L. CURRIERu

